ATTUATORI .
- PNEUMATIC ACTUATORS AND ACCESSORIES -
UsermanING ISSUE .10 March 2004
GT ATTUATORI S.r.l. REA MI 1558400 FAX (02) 90390368
V.le Europa 17 - 20090 Cusago Partita IVA e Cod.Fisc.12449540157 TEL (02) 90390322
Milan - ITALY- E-mail g.trevisan@iol.it
www.gtrevisan.it
PAG. 10 OF 20
INSTALLATION
OPERATION &
MAINTENANCE MANUAL
CAUTION:
NEVER GIVE COMPRESSED AIR TO THE ACTUATOR
BEFORE TO CHECK VERY WELL
IF PINION IS FIXED BY SNAP RING (SEEGER)
AND END CAPS WELL CLOSED WITH TIGHTENED SCREWS
6.12 - Pressurize right port on actuator body to test for air leaks. Leaks can occur around pinion and between
end cap and body mating surfaces.
If an air leak is found near the end cap, remove end cap and check for proper O-Ring seating.
If O-Ring appear to be in good condition, repeat the step 6.11.
Presurize left port on actuator to test for pinion air leaks. If an air leak develops near the pinion and body
mating areas, remove the pinion from the body, as at point 5.6 taking well care that pistons do not change position
inside the actuator body, during this operation.
Inspect upper and/or lower pinion O-Rings, selon where the leak is found
If O-Rings appear in good condition, verify for burrs into O-Ring grooves. Clean very well and reinsert O-
Rings in their seats.
Insert pinion into actuator body in the same orientation as before, taking well care not to move pistons.
If pistons are moved repeat steps from point 6.5. Install pinion washer and snap ring.
Begin test again as described in this section.
If the problem persist contact your local G.T. Attuatori representative.
7.0 CARTRIDGE SPRINGS INSTALLATION
The actuators have the unique ability to be field converted from DOUBLE ACTING to a SPRING
RETURN actuator type, or viceversa, by changing very easily the spring configuration inside the end caps. (NOTE:
refer to table 3 on next page).
The
actuators can accept up to 6 cartridge springs in each end cap, also if very rarely they are
less than 2.
The number of cartridge springs loaded into the actuator affects the amount of torque the actuator will
be able to generate during the closing and opening portions of the cicle.
Review sctions 11, 12 and 13 on actuator sizing, for correct procedures in selectint spring combinations.
7.1 - Drive the actuator in closed position ( See figures 1 at pag. 3 ).
7.2 - Remove end caps.
7.3 - As it is not possible to see the rack position with pistons assembled into actuator body, refer to
mark present in one of springs seats of the piston, corresponding to which there is the rack on the other side of the
piston. ( See figure 7: that seat is numbered 1 ).
7.4 - Fixed the number of cartridge springs to put in each cap, insert them according to table 3 and fifure 7.
( Example: Model GTXN.110x90.NP22A.K4 has 4 cartridge springs per end cap ).
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